$9.99 – 5V LCD Display 18650 Lithium Battery Capacity Tester (5V LCD Display 18650 Lithium Battery Capacity Tester Power Detector Module 2 Way with Charging Discharge Type-c Port).
5V LCD Display 18650 Lithium Battery Capacity Tester is for $9.99 (in Banggood). Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
Latest coupon and price update (UTC):
Banggood ($9.99)
Banggood warehouse is located in China. CouponsFromChina software could not find any coupon for this product in Banggood. Price? Good price! It’s lower than average one ($10.24)!
Link: Banggood product page
Price: $9.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BG589b2e, BG5c1899, BGcbd315
(you can check these old coupons out, but these probably won’t work)
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for 5V LCD Display 18650 Lithium Battery Capacity Tester. The lowest price was: $8.99.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).